:root{--bg: #f7f3ea;--surface: #fffdf8;--ink: #1d2721;--muted: #5b6660;--line: #e3dccd;--green: #1f4d3a;--green-2: #2f6b52;--green-soft: #e4eee8;--orange: #d9772b;--orange-ink: #9a4a0f;--orange-soft: #fbead9;--red: #a8322b;--red-soft: #f8e1de;--ok: #1f6b45;--ok-soft: #dff0e6;--radius: 14px;--shadow: 0 1px 2px rgba(31, 45, 36, .06), 0 4px 16px rgba(31, 45, 36, .05);--font: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;--font-en: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;--font-ipa: "Charis SIL", "Doulos SIL", "Gentium Plus", "Lucida Sans Unicode", "Segoe UI", "Arial Unicode MS", sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.7}h1,h2,h3,h4{line-height:1.3;margin:0 0 .5em;font-weight:650}h1{font-size:1.85rem;letter-spacing:.01em}h2{font-size:1.3rem}h3{font-size:1.1rem}p{margin:0 0 .8em}a{color:var(--green-2);text-underline-offset:3px}a:hover{color:var(--green)}:focus-visible{outline:3px solid var(--orange);outline-offset:2px;border-radius:6px}[tabindex="-1"]:focus{outline:none}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}.narrow{max-width:760px;margin:0 auto}.muted{color:var(--muted)}.small{font-size:.88rem}.big{font-size:1.25rem;font-weight:650}.eyebrow{color:var(--orange-ink);font-size:.9rem;font-weight:600;letter-spacing:.04em;margin-bottom:.3em}.lead{font-size:1.08rem;color:#33403a}.row-between{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.skip-link{position:absolute;left:-999px;top:8px;background:var(--green);color:#fff;padding:8px 14px;border-radius:8px;z-index:10}.skip-link:focus{left:8px}.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px;gap:16px}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--green);font-weight:700;font-size:1.15rem;text-decoration:none;letter-spacing:.06em}.brand .dot{color:var(--orange)}.main-nav{display:flex;gap:4px}.main-nav a{padding:8px 14px;border-radius:999px;color:var(--ink);text-decoration:none;font-weight:500}.main-nav a:hover{background:var(--green-soft)}.main-nav a[aria-current=page]{background:var(--green);color:#fff}main{padding-top:28px;padding-bottom:48px;min-height:70vh}.site-footer{color:var(--muted);font-size:.85rem;padding-bottom:96px;border-top:1px solid var(--line);padding-top:16px}.notice{background:var(--orange-soft);border-bottom:1px solid #efcfaf}.notice .wrap{display:flex;justify-content:space-between;align-items:center;gap:12px;padding-top:10px;padding-bottom:10px}.banner{background:var(--orange-soft);border:1px solid #efcfaf;border-radius:10px;padding:10px 14px;margin:12px 0}.banner a{margin:0 4px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin-bottom:18px}.grid-2{display:grid;grid-template-columns:1.3fr 1fr;gap:18px}.grid-2>.card{margin-bottom:0}.grid-2+*{margin-top:18px}.page-head{margin-bottom:20px}.btn,.choice-pill{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--green);background:var(--green);color:#fff;border-radius:10px;padding:9px 18px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;line-height:1.4}.btn:hover{background:var(--green-2);color:#fff}.btn.big{padding:12px 24px;font-size:1.05rem}.btn.small{padding:5px 12px;font-size:.88rem}.btn.ghost{background:transparent;color:var(--green)}.btn.ghost:hover{background:var(--green-soft);color:var(--green)}.btn.danger{background:var(--red);border-color:var(--red)}.btn.danger-ghost{background:transparent;color:var(--red);border-color:var(--red)}.btn:disabled,.btn[disabled]{opacity:.5;cursor:not-allowed}.btn-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:12px 0}.audio-btn-wrap{display:inline-flex;flex-direction:column;gap:2px}.audio-btn{display:inline-flex;align-items:center;gap:6px;font:inherit;cursor:pointer;border-radius:999px;border:1px solid var(--green);background:var(--surface);color:var(--green);padding:7px 16px;font-weight:600}.audio-btn.primary{background:var(--green);color:#fff}.audio-btn.chip{padding:3px 12px;font-size:.92rem;font-family:var(--font-en);font-weight:500}.audio-btn.playing{background:var(--orange);border-color:var(--orange);color:#fff}.audio-btn.error{border-color:var(--red);color:var(--red);background:var(--red-soft)}.audio-icon{font-size:.8em;width:1em;text-align:center}.audio-status{font-size:.8rem;min-height:0}.audio-error{color:var(--red)}.audio-note{color:var(--orange-ink)}.audio-source{color:var(--muted)}.ok-text{color:var(--ok)}.welcome{max-width:760px;padding:24px 0 8px}.welcome h1{font-size:2.2rem;color:var(--green)}.facts{padding-left:1.2em;margin:18px 0}.facts li{margin-bottom:6px}.continue-card{border-top:4px solid var(--orange)}.mini-steps{padding-left:1.2em;color:var(--muted);margin-bottom:16px}.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:0 0 12px}.stats div{background:var(--bg);border-radius:10px;padding:10px 12px}.stats dt{font-size:.85rem;color:var(--muted)}.stats dd{margin:0;font-size:1.35rem;font-weight:700;color:var(--green)}.stage-bars{list-style:none;padding:0;margin:0 0 12px}.stage-bars li{display:grid;grid-template-columns:minmax(0,1fr) 140px 40px;gap:12px;align-items:center;padding:6px 0}.stage-name{font-size:.95rem}.bar{display:block;height:8px;background:var(--green-soft);border-radius:99px;overflow:hidden}.bar>span{display:block;height:100%;background:var(--green-2);border-radius:99px;transition:width .3s}.quick-links{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.link-card{display:flex;flex-direction:column;text-decoration:none;color:var(--ink);margin:0}.link-card:hover{border-color:var(--green-2)}.choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.choice-card{text-align:left;display:flex;flex-direction:column;gap:4px;padding:14px;border-radius:12px;border:1px solid var(--line);background:var(--bg);font:inherit;cursor:pointer;color:var(--ink)}.choice-card.on{border-color:var(--green);background:var(--green-soft);box-shadow:inset 0 0 0 1px var(--green)}.choice-pill{background:var(--surface);color:var(--green)}.choice-pill.on{background:var(--green);color:#fff}.stage{margin-bottom:28px}.stage-num{color:var(--orange-ink);font-size:.95rem;margin-right:6px}.lesson-list{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.lesson-link{display:flex;gap:14px;align-items:flex-start;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:12px;text-decoration:none;color:var(--ink);height:100%}.lesson-link:hover{border-color:var(--green-2)}.lesson-item.next .lesson-link{border-color:var(--orange);box-shadow:inset 0 0 0 1px var(--orange)}.lesson-num{flex:none;width:34px;height:34px;border-radius:50%;background:var(--green-soft);color:var(--green);display:grid;place-items:center;font-weight:700}.lesson-item.done .lesson-num{background:var(--green);color:#fff}.lesson-text{display:flex;flex-direction:column;flex:1;min-width:0}.req{color:var(--orange-ink)}.status-tag{flex:none;font-size:.78rem;padding:2px 8px;border-radius:99px;background:var(--bg);color:var(--muted);white-space:nowrap}.status-tag.done{background:var(--ok-soft);color:var(--ok)}.status-tag.next{background:var(--orange-soft);color:var(--orange-ink)}.crumbs{margin-bottom:8px;color:var(--muted)}.goal{background:var(--green-soft);border-radius:10px;padding:12px 16px}.tabs{display:flex;gap:6px;margin:18px 0;position:sticky;top:60px;background:var(--bg);padding:8px 0;z-index:4;overflow-x:auto}.tab{flex:1;min-width:80px;font:inherit;font-weight:600;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}.tab.on{background:var(--green);border-color:var(--green);color:#fff}.step h3{display:flex;align-items:center;gap:10px}.step-n{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--orange-soft);color:var(--orange-ink);font-size:.9rem;flex:none}.step-words{display:flex;flex-wrap:wrap;gap:14px;margin-top:10px}.step-word{display:flex;align-items:center;gap:10px;background:var(--bg);padding:8px 12px;border-radius:12px;flex-wrap:wrap}.mistakes ul{list-style:none;padding:0;margin:0}.mistakes li{padding:8px 0;border-bottom:1px dashed var(--line);display:flex;flex-direction:column}.mistakes li:last-child{border-bottom:0}.wrong{color:var(--red)}.fix{color:var(--ok)}.summary li{margin-bottom:6px}.complete-box{margin-top:18px;background:var(--ok-soft);border-radius:12px;padding:16px}.parts{display:inline-flex;gap:4px;flex-wrap:wrap}.part{display:inline-flex;flex-direction:column;align-items:center;min-width:2.1em;padding:2px 6px;border-radius:8px;background:var(--green-soft);border:1px solid transparent}.part-g{font-family:var(--font-en);font-size:1.35rem;font-weight:600;color:var(--green);line-height:1.25}.part-p{font-family:var(--font-ipa);font-size:.8rem;color:var(--muted)}.part.silent{background:transparent;border:1px dashed var(--line)}.part.silent .part-g{color:#9aa29d}.part.active{background:var(--orange-soft);border-color:var(--orange)}.word-table .parts .part-g{font-size:1.05rem}.ipa{font-family:var(--font-ipa);color:#3d4a43}.phoneme-card{background:var(--bg);border-radius:12px;padding:16px;margin-top:10px}.phoneme-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:8px}.ipa-big{font-family:var(--font-ipa);font-size:2rem;color:var(--green)}.phoneme-name{font-weight:600}.voice-tag{font-size:.8rem;padding:2px 10px;border-radius:99px}.voice-tag.on{background:var(--orange-soft);color:var(--orange-ink)}.voice-tag.off{background:var(--green-soft);color:var(--green)}.phoneme-tips{margin:10px 0;display:grid;gap:6px}.phoneme-tips div{display:grid;grid-template-columns:6.5em 1fr;gap:8px}.phoneme-tips dt{color:var(--muted);font-size:.9rem}.phoneme-tips dd{margin:0}.phoneme-tips .warn dd{color:var(--red)}.phoneme-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-bottom:28px}.phoneme-grid .phoneme-card{background:var(--surface);border:1px solid var(--line);margin:0}.chip-row,.chunks{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.mouth{margin:8px 0}.mouth svg{width:100%;max-width:420px;height:auto;display:block}.mouth figcaption{font-size:.78rem;color:var(--muted)}.m-lip{fill:#c98375}.m-inner{fill:#4a2622}.m-seam{stroke:#7a3e35;stroke-width:2}.m-teeth{fill:#fff}.m-tongue{fill:#e59a91}.m-palate{fill:none;stroke:#7d877f;stroke-width:2}.m-teeth-side{fill:#fff;stroke:#b9bfba}.m-lip-side{fill:none;stroke:#c98375;stroke-width:4;stroke-linecap:round}.m-tongue-side{fill:#e59a91;opacity:.9}.m-curl{fill:none;stroke:#b5574c;stroke-width:2}.m-dot{fill:var(--orange)}.m-arrow{stroke:var(--green-2);stroke-width:2}.m-arrowhead{fill:var(--green-2)}.m-voice{fill:none;stroke:var(--orange);stroke-width:2}.m-novoice{stroke:#9aa29d;stroke-width:2;stroke-dasharray:3 3}.m-label{font-size:9px;fill:var(--muted);font-family:var(--font)}.four-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:0;list-style:none;counter-reset:s;margin:0 0 16px}.four-steps li{counter-increment:s;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-size:.9rem}.four-steps li:before{content:counter(s);display:inline-grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--orange);color:#fff;font-size:.8rem;margin-right:6px}.practice-grid{display:grid;grid-template-columns:260px 1fr;gap:18px;align-items:start}.pick-list{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:6px;position:sticky;top:130px}.pick-list p{margin:6px 0 0}.pick-words{display:flex;flex-wrap:wrap;gap:6px}.pick{font:inherit;font-family:var(--font-en);text-align:left;border:1px solid var(--line);background:var(--bg);border-radius:8px;padding:6px 10px;cursor:pointer;color:var(--ink)}.pick.small{padding:3px 10px}.pick.on{background:var(--green);color:#fff;border-color:var(--green)}.player{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;margin:10px 0}.player-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.word-big{font-family:var(--font-en);font-size:2.6rem;font-weight:600;color:var(--green);line-height:1.1}.word-mid{font-family:var(--font-en);font-size:1.5rem;font-weight:600;color:var(--green)}.zh{color:#3d4a43}.note{background:var(--orange-soft);border-radius:8px;padding:6px 10px;font-size:.92rem}.tip{background:var(--green-soft);border-radius:8px;padding:8px 12px;font-size:.95rem}.sentence-line{font-family:var(--font-en);font-size:1.6rem;line-height:1.6;margin-bottom:4px;border-radius:10px;padding:4px 6px;transition:background .2s}.sentence-line.playing{background:var(--orange-soft)}.tok{font:inherit;background:none;border:0;padding:0 2px;cursor:pointer;color:var(--ink);border-radius:6px;border-bottom:2px solid transparent}.tok.stress{font-weight:700;color:var(--green)}.tok.hl{background:var(--orange);color:#fff}.tok.chunk-hl{background:#f5d7b8}.tok.sel{border-bottom-color:var(--orange)}.selected-word{background:var(--bg);border-radius:10px;padding:12px;margin-top:10px}.sel-head{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-bottom:6px}.fav-btn{font:inherit;font-size:.9rem;border:1px solid var(--line);background:var(--surface);border-radius:99px;padding:3px 12px;cursor:pointer;color:var(--muted);white-space:nowrap}.fav-btn.on{color:var(--orange-ink);border-color:var(--orange);background:var(--orange-soft)}.recorder{border-top:1px dashed var(--line);margin-top:16px;padding-top:12px}.recorder h4{font-size:1rem}.rec-status{font-size:.92rem;color:var(--muted)}.rec-denied,.rec-nodevice,.rec-insecure,.rec-unsupported,.rec-error{color:var(--red)}.rec-recording{color:var(--orange-ink);font-weight:600}.rec-dot{width:10px;height:10px;border-radius:50%;background:#fff;display:inline-block;animation:pulse 1s infinite}.rec-audio{width:100%;max-width:420px;margin-top:6px}@keyframes pulse{50%{opacity:.3}}.quiz-progress{display:flex;align-items:center;gap:12px;margin-bottom:12px;font-size:.9rem;color:var(--muted)}.quiz-progress .bar{flex:1}.retry-tag{background:var(--orange-soft);color:var(--orange-ink);padding:1px 8px;border-radius:99px;font-size:.8rem}.quiz-prompt{font-size:1.1rem;font-weight:600}.quiz-focus{display:flex;gap:12px;align-items:baseline}.hint{background:var(--bg);border-radius:8px;padding:6px 10px;font-family:var(--font-ipa)}.options{display:grid;gap:10px;margin:14px 0}.option{display:flex;align-items:center;gap:12px;text-align:left;font:inherit;padding:12px 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16px}.feedback.ok{background:var(--ok-soft)}.feedback.no{background:var(--red-soft)}.fb-title{font-weight:700}.quiz-done{background:var(--ok-soft);border-radius:12px;padding:16px}.big-num{font-size:2.6rem;font-weight:700;color:var(--green);margin:0}.filters{display:flex;flex-wrap:wrap;gap:16px;align-items:center}.filters label{display:flex;align-items:center;gap:8px}input[type=search],select,.reset-confirm input{font:inherit;padding:6px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}.check{display:inline-flex;align-items:center;gap:6px;margin-right:14px}.word-cards{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}.word-card{margin:0;display:flex;flex-direction:column;gap:8px}.wc-meta{display:flex;gap:10px;flex-wrap:wrap}.word-table{width:100%;border-collapse:collapse}.word-table th,.word-table td{text-align:left;padding:8px 6px;border-bottom:1px solid var(--line);vertical-align:middle}.word-table th{font-size:.85rem;color:var(--muted);font-weight:600}.letter-grid{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}.letter-card{margin:0}.letter-big{font-family:var(--font-en);font-size:2rem;color:var(--green);font-weight:600}.letter-sounds{list-style:none;padding:0;margin:0;display:grid;gap:6px}.letter-sounds li{display:flex;gap:10px;align-items:center}.rate-set{border:0;padding:0;margin:10px 0 0}.rate-set legend{margin-bottom:4px}.danger-zone{border-color:#eac3be}.reset-confirm label{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.tag{display:inline-block;font-size:.78rem;padding:1px 9px;border-radius:99px;background:var(--green-soft);color:var(--green);white-space:nowrap;vertical-align:middle}.tag.soft{background:var(--bg);color:var(--muted);border:1px solid var(--line)}.en-line{font-family:var(--font-en);font-size:1.15rem;line-height:1.6;margin:0 0 .3em;color:var(--ink)}kbd{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.75rem;border:1px solid currentColor;border-radius:4px;padding:0 4px;margin-left:4px;opacity:.7}.btn-row.center{justify-content:center}.voice-notice{background:var(--surface);border:1px dashed var(--line);border-radius:10px;padding:8px 12px;color:#33403a}.goal-picker{display:inline-flex;gap:8px;align-items:center;font-size:.92rem;margin-top:6px}.goal-picker select,.filters select,.filters input{font:inherit;padding:6px 8px;border-radius:8px;border:1px solid var(--line);background:var(--surface);color:var(--ink)}.level-cards{list-style:none;padding:0;margin:0 0 18px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.level-cards .card{margin:0;display:flex;flex-direction:column;gap:6px}.level-cards .btn-row{margin-top:auto;padding-top:8px}.source-list li{word-break:break-word}.theme-chips{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 6px}.theme-chips .choice-pill{font-size:.88rem;padding:4px 12px;border-radius:99px;border:1px solid var(--line);cursor:pointer;font-family:inherit}.v2-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:18px}.v2-grid .card{margin:0;display:flex;flex-direction:column;gap:4px}.v2-grid .card .btn{align-self:flex-start;margin-top:auto}.v2-grid h2{font-size:1.12rem}.session{display:grid;gap:12px}.session-head{gap:8px}.flashcard{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:26px 22px;display:grid;gap:14px}.fc-front{display:grid;gap:10px}.fc-word{font-family:var(--font-en);font-size:2.8rem;font-weight:600;color:var(--green);text-align:center;line-height:1.2;word-break:break-word}.fc-actions{text-align:center}.fc-back{border-top:1px dashed var(--line);padding-top:14px;display:grid;gap:8px;animation:fc-in .25s ease-out}.fc-back:focus{outline:none}@keyframes fc-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}.fc-meaning{display:flex;gap:10px;align-items:center;justify-content:center;margin:0;flex-wrap:wrap}.fc-meaning .ipa{font-size:1.2rem}.fc-zh{text-align:center;font-size:1.1rem;margin:0}.fc-example{background:var(--bg);border-radius:12px;padding:10px 14px}.fc-example p{margin:0 0 4px}.grade-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:6px}.btn.grade{justify-content:center;width:100%}.btn.g-unknown{background:var(--red);border-color:var(--red);color:#fff}.btn.g-fuzzy{background:var(--orange-soft);border-color:var(--orange);color:var(--orange-ink)}.btn.g-know{background:var(--green);border-color:var(--green);color:#fff}.btn.g-unknown:hover{background:#8f2a24}.btn.g-fuzzy:hover{background:#f7dcc0;color:var(--orange-ink)}.session-done .inline-list{display:flex;flex-wrap:wrap;gap:6px 14px;padding:0;list-style:none;margin:8px 0}.vocab-rows{list-style:none;padding:0;margin:0 0 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